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49 lines
2.9 KiB
C
49 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/thread/thread.h"
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/**
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* Sets contention scope attribute.
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*
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* @param contentionscope may be one of:
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* - `PTHREAD_SCOPE_SYSTEM` to fight the system for resources
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* - `PTHREAD_SCOPE_PROCESS` to fight familiar threads for resources
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* @return 0 on success, or errno on error
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* @raise ENOTSUP if `contentionscope` isn't supported on host OS
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* @raise EINVAL if `contentionscope` was invalid
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*/
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errno_t pthread_attr_setscope(pthread_attr_t *attr, int contentionscope) {
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switch (contentionscope) {
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case PTHREAD_SCOPE_SYSTEM:
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attr->__contentionscope = contentionscope;
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return 0;
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case PTHREAD_SCOPE_PROCESS:
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// Linux almost certainly doesn't support thread scoping
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// FreeBSD has THR_SYSTEM_SCOPE but it's not implemented
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// OpenBSD pthreads claims support but really ignores it
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// NetBSD pthreads claims support, but really ignores it
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// XNU sources appear to make no mention of thread scope
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// WIN32 documentation says nothing about thread scoping
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return ENOTSUP;
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default:
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return EINVAL;
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}
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}
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